OEM Toyota Echo Thermostat

Toyota Echo Thermostat Parts and Q&A

• Thermostat
  90916-03093
  Q: How to service and repair a thermostat on Toyota Echo?

  A:

  Service and repair of the thermostat starts with draining the engine coolant. Begin by disconnecting the wire harness clamp from the water inlet followed by removing 2 nuts until you remove the water inlet from the cylinder block before removing the thermostat and its gasket. A thermostat should be inspected through exposure to water while temperature increases gradually to verify the valve opens between 80 - 84 degrees Celsius (176 - 183 degrees Fahrenheit); the device requires replacement if this range is not achieved. A new thermostat requires replacement when either the valve lift measurement falls below 8.5 mm (0.345 inch) at 93 degrees Celsius (199 degrees Fahrenheit) testing or when the valve fails to close properly at temperatures below 40 degrees Celsius (104 degrees Fahrenheit). Your installation process should begin with a new gasket over the thermostat and correct placement of the jiggle valve upward before setting it within 10 degrees from its specified position. The 2 nuts should be installed onto the water inlet before wiring harness connection using a torque setting of 9.0 Nm (90 kgf-cm, 80 inch lbs.). To complete the system delivery, add engine coolant while starting the engine then look for any leakage.